Knock-limited performance of ethanol blends in a spark-ignition engine

Technical Report · Thu Jan 01 00:00:00 EST 1981

DOI:https://doi.org/10.2172/5267117· OSTI ID:5267117

Ferfecki, F. J.; Sorenson, S. C.

An experimental study was performed to determine the effect of varying percentages of ethanol in fuel using a CFR engine operated at knock-limited compression ratio and maximum power spark timing. Blends of 85 octane primary reference fuel and ethanol in concentrations between 10 and 25% by volume were tested for performance, fuel economy, and exhaust emissions. The results indicated that when the engine was operated at knock-limited conditions at a constant equivalence ratio, the use of ethanol resulted in a reduction in petroleum fuel usage of 10% greater than the volumetric percentage of the ethanol used in the blend. These results were independent of the amount of ethanol used in the blend. Under these conditions, as the ethanol concentration was increased, BMEP and BSHC increased, BSNO and BSCO remained essentially constant, and exhaust temperature decreased.

• Research Organization: Univ. of Illinois at Urbana-Champaign, IL (United States)
• DOE Contract Number: AS02-78ER10004
• OSTI ID: 5267117
• Report Number(s): DOE/ER/10004-T1; ON: DE82015203
• Resource Relation: Other Information: Portions of document are illegible
• Country of Publication: United States
• Language: English

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33 ADVANCED PROPULSION SYSTEMS
CARBON MONOXIDE
AIR POLLUTION CONTROL
GASOHOL
PERFORMANCE
HYDROCARBONS
NITROGEN OXIDES
SPARK IGNITION ENGINES
EXHAUST GASES
FUEL ECONOMY
FUEL SUBSTITUTION
COMPRESSION RATIO
ENVIRONMENTAL EFFECTS
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CHALCOGENIDES
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ENGINES
FLUIDS
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LIQUID FUELS
NITROGEN COMPOUNDS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
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330800* - Emission Control- Alternative Fuels
330101 - Internal Combustion Engines- Spark-Ignition